Relief valve



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July 15, 1941.

July 1s, `194.1.

w. a HUBBARD RELIEF VALVE File@ Jan. g4,

2 Sheets-Sheet 2 INVENT'OR ATTORNEYS Psrentea July is, 1941 UNITED sTATEs- PATENT OFFICE'.

' william E. nimma, Tuvkn., mlm: te

Hydraulic Pumper Incorporated, a corporation of Oklahoma Appucamnhnuary 24. 193s, serial Noizszss `g. y(c1. 1st-ss) This invention relates to a valve attachment used in commotion with force pumps. and more particularly but not by way of limitation to an improvement in a relief valve for use with a longstroke hydraulic .pump shown in my'co" pending 20, 1939.

' A n--important object of this inventionis to provide a relief valve structure for use with a fluid pump which will automatically allow for free circulation between the discharge and intake sides ofthe pump in any unbalanced pressur application Serial No. 252,032, filed Jan.

condition of the pump.

And stilla further object of this invention is to provide a relief valve structure capablek of relieving a distorted pressure condition in a fluid partition 6. k'Ine lowercorner of the'bushing I6 is inclined to form an annular valveseat I6 for a purpose as will behereina'fter set forth. The housing 2A is provided with arecess 20 com--l 'municating with-the -bore 6 for the reception of a bushing 22 pressed into fitted relationship therewith.

An annular 'valve head 24 is slidably disposed adjacent the bushing 22 and comprises la hollow body portion. of substantial rectangular shape in cross section. An angular shaped (in cross pump, wherein means are provided to automati` cally relieve the pressure on one si de of an active valve head, thereby causing the head to be moved and eifecting an equalization of the pump-pres-4 sures.

And still a further object of Athis-invention is to arrange the parts of avrelief valve structure for use with a fluid pump, so that they can be readily disassembled for the purpose of repairs and the like.

Other objects and advantages of my invention will be evident from the following detailed description read in conjunction with the accompanying drawings which illustrate one form of my new invention.

In the drawings:

section)v projection 26 extends from the portion 26 and has enlarged outer periphery 20 provided with an inclined outer face22 forming the valve face proper. and adapted to contact the seat i6.

An annular rim 34 is disposed above the projec'- tion 28 and is supported by a plurality of equally spaced vertical ribs integral with and extending from the projection 2l. The annular rim functions to guide the head'properly in the bush' l lmunication between the spaced chambers be- Fig. 1 is a vertical sectional view of my improved relief valve structure taken on line I-I of Fig. 5,

Fig. 2 is a horizontal sectional View taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged horizontal sectional view taken on line 3 3 of Fig. 1.

Fig. 4 is a vertical sectional view taken on lines 4-4 of Fig. 5, showing the housings separated. v

side of the :duid pump (not shown) while the chamber I4 vis in communication with the discharge side of the pump. An annular bushing 'I6 (of L-shaped cross section), is pressed into the chamber i2 between the housing 2 and the tween ribs 28' and the chamber 49 provided by the hollow body 26. The body 26 is provided with an annular depending flange 60, having a recess 62 for the reception of one end of a helical spring 64 as will be hereafter set out.

A lower housing 66 is secured to the housing 2 by the bolts 66 (Fig. 1), and is provided with, a sleeve 69 forming a central bore having oppositely disposed enlarged chambers 62 and 64. The bore of the sleevei is adapted to receive a tubular piston 66 (U-shaped in cross-section) having a port 66 provided with a tapered socket, forming a valve seat -lll, in communication with the chamber .64. The hollow piston 4valve receives a helical spring 12 having one end anchored in the piston and'the other end anchored to a threaded plug 14 disposed in one end of the lower housing. The opposite end of the housing 66 has a threaded recess 'I6 in communicationV with chamber 64, 'and receives a plug member 'I6 having a'partially threaded aperture 18 for the reception of a recessed stud 80. Theunthreaded portion of the aperture receives an anchamber!! andthechamber I2.

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the pump (not shown) becomes excessive, the iluid iiow is increased through the screen 4I, ports I2, orince Il and as a solid moves the the aperture or port .I into the chamber il, chanmer l! and up through the conduit i! into the chamber l2. thus creating a low pressure area in the chamber 4l. The low pressure is due to the i'act that the amount of iluld passing throughtheorincellisnotasgreatasthe iluid going trom chamber ll through the conduit l2. With the continual discharge o! iluid through the by-pass l2, and out o! the chamber l., the discharge pressure in the chamber il from the pump acting against the top face of the body portion Il will move the valve head Miromitsseat Il, allowingthe nuidtopass direct from the discharge chamber I4 into the chamber I2. -1

The direct passage of the fluid irom the discharge side to the intake side o! the pump (not shown). causes an equalization oi the pressures inthepump,andassoonasthepump pressure becom'es normal, the tension of spring 12 will move the valve Il toward the pilot valve Il, immediately sealing oi! the flow o! fluid into the'chamber or bore il and conduit l2. At theinstantofsealingotl,thepressureinthe chamber 4l will be increased. consequently increasing the iiuid pressure iiowing through the port Il to assist the spring Il in eilecting a seating oi' the pilot valve I2 with the piston socket 1I. This increase of pressure in chamber ll cooperates with the spring I4 to close the valve head 2l, and its enlarged portion il against the seat Il, thereby allowing the head ftoassmneitsnormslpcsltionandstoptheow of iluid from the chamber Il to the chamber Il.

(Fig. 4), provides communicathe valve stnicture.itisoiten dedroustoeilect a warming un operation. whlchwquld necessitweenthechamberllandaconduit I, communicatingwiththecondultn. Athreaded studillisdisposedinthehousingllandprovidedatoneendwithatmsto-conicalauxlliary valve i, adapted to close against acomple precise embodiment of the invention may be made within the scope oi' the following claims without departing from the spirit of the invcntion.

What I claim is:

l. In a relief valve for use with a iluid pressurepump comprisingahousinghavingabore forming an inlet and an outlet. a valve head controlling communication between the inlet and outlet, said valve head provided with a plurality of partitions forming a plurality of chambers in communication with the inlet, means provided in each of the partitions allowing passage of uid between the chambers, means providing communication between one o! the chambers and one side of the valve head, and means for relieving iluid pressure on said one side of the valve head.

2. In a relie! valve for use with a iluid pressure pump comprising a housing having a bore forming an inlet and an outlet, a valve head controlling communication between the inlet and outlet, said valve head provided with a plurality of partitions forming a plurality of chambers in communication with the inlet, a port provided in each of the partitions allowing passage of iiuid between the chambers, an orince providing communication between one of the chambers and one side o! the valve head, and means tor relieving fluid pressure on said one side oi' the valve head.

WILLIAM E. HUBBARD. 

